Which plugs for Mecruiser 233hp 351

[wet_wonder]

"Hi, I have an inboard Mercru

"Hi, I have an inboard Mercruiser 233hp 351 in a '75 Trojan F-25. I think that based on the serial number the motor is a 1977 build. I pulled the plugs and they're ACDelco vehicle engine plugs, not marine. I don't have a manual for the motor so don't know which plugs are spec'd for it. Does anyone out there know the correct Marine Plug? The motor is a fairly new rebuild and runs very well.
Thanks, Dave"

 

[bondo]

"Ayuh,... Just add an "M&

"Ayuh,... Just add an "M" to the begining of the AC Delco part #....
Such as the R43T plugs are the automotive equalivent of the Marine MR43T plugs..."

 

[wet_wonder]

Thank you.

Thank you.